Without more context, I'm not sure what a stand-off is, but to rig something means to make a temporary or makeshift apparatus to accomplish something. Often it may result in poor workmanship due to not having the actual supplies or tools needed.
It is sometimes used as short form of jury-rig or jerry-rig. There are a number of other terms for this, which since they use racial epithets I won't bother including.
I would gather that a stand-off is some kind device, and the partial sentence is suggesting that it may be beneficial to create a makeshift stand-off.
The t.v show (which I hear is going to be rebooted:-D) MacGyver was about a man who instead of using guns to extricate himself from a situation used his extensive knowledge of chemistry, physics, and mechanics to rig makeshift devices to solve whatever situation he was trapped in for the current week's show.
I just remembered what a stand-off might be. It's a u-shaped board or pipe used to lean your ladder against, to keep your ladder from touching the edge of a roof. If you lean your ladder against the edge of the roof, you'll likely damage the shingles and drip edge, so you place a stand-off as a spacer between your ladder and the fascia.
In lieu of a fancy standoff, we'd often rig a makeshift one by simply nailing several boards to the fascia, then lean the ladder against them.